Did you add a portal alias for www.myportal.com?  DNN only installs as localhost....you then have to add the portal alias that the website will answer to.  It is a "security thing".  DNN will only answer to the listed aliases.

---

Shadow

Certainly!

The procedure is essentially the same for IIS versions 5 and 6.  In short, you go into the site, click Properties, and then on that first tab that comes up (the Web Site tab) click Advanced.  Here, at the top, it says "Multiple identities for this Web site".  Click Add, choose your IP address, enter port 80, and type in the URL for instance www.mydomain.com without the quotes.  Note, it's very detail-specific.  Usually I always enter it twice for every domain, with and without the www.  It's not the full URL, just the host address that matters (for example you don't have to type anything after the .com in the above example).

You can also review this procedure at this Microsoft knowledge base article:

http://support.microsoft.com/kb/324287/en-us

---

Shane Miller